Signal detection device in full optical fiber perturbation sensing and fixing network system

Abstract

The invention provides a signal detection device in an all-fibre disturbance sensing and positioning network system, relating to the fire sensing detection technical field, in particular to a weak signal detection device for safely monitoring perimeter security. The output terminal of the transmission module of the signal to be detected of the invention is connected with the input terminal of a photoelectric converter and transmits the optical signal to be detected to the photoelectric converter; the output terminal of the photoelectric converter is connected with the input terminal of a preamplifier and converts the optical signal to be detected into electric signal; the output terminal of the preamplifier is connected with the input terminal of a selection filter and amplifies the electric signal and filtrates partial noises; the output terminal of the selection filter is connected with the input terminal of a phase-locked amplifier; the output terminal of the phase-locked amplifieris connected with the input terminal of a computer characteristic analysis system; the electric signal is amplified with noises filtrated by the phase-locked amplifier and is then transmitted to the computer characteristic analysis system. The signal detection device in the full fibre disturbance sensing and positioning network system realizes the objects of high sensitiveness, simple structure, long monitoring distance and precise positioning.

Description

technical field [0001] The present invention relates to the technical field of optical fiber sensing and detection, in particular to pipeline monitoring for various types of dangerous or high-value chemical product pipeline safety monitoring and monitoring, as well as important warehouses, important terminal warehouses, hangars, explosives warehouses, border lines, Monitoring of aviation, aerospace bases, missile bases, banks, museums, prisons, etc.; safety monitoring and monitoring of urban tap water, gas, natural gas, and heating pipelines; full-fiber-optic intelligent defense for perimeter security monitoring and monitoring of long-distance oil and natural gas pipelines Weak signal detection device in the system. Background technique [0002] Now with the vigorous development of social security, various safety monitoring equipment emerge in endlessly. The outdoor perimeter intrusion detector is a detector used for outdoor large-area border monitoring, and it has received...

AI Technical Summary

Problems solved by technology

However, because the measured signal is weak, the background noise of the sensor, the inherent noise of the amplifier circuit and the measuring instrument, and the external interference noise are often much larger than the amplitude of the useful signal. The process of amplifying the measured signal also amplifies the noise. Moreover, some additional noise will inevitably be added, such as the internal inherent noise of the amplifier and the influence of various external interferences, so weak signals cannot be detected only by amplification

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